/Engine/Plugins/Animation/MLDeformer/MLDeformerFramework/Source/MLDeformerFramework/Public/MLDeformerMorphModel.h
Get the start index into the array of deltas (vectors3's), for a given morph target. This does not perform a bounds check to see if MorphTargetIndex is in a valid range, so be aware.
The start index, or INDEX_NONE in case there are no deltas.
int32 GetMorphTargetDeltaStartIndex ( int32 MorphTargetIndex ) const